Comparative immunohistochemical expression of RANK, RANKL and OPG in radicular and dentigerous cysts.

Abstract:

OBJECTIVE:Receptor activator of nuclear factor-κB (RANK), RANK ligand (RANKL) and osteoprotegerin (OPG) are members of the superfamily of ligands and receptors of tumour necrosis factor family involved in bone metabolism. The formation, differentiation and activity of osteoclasts are regulated by these proteins. To clarify the roles of osteoclast regulatory factors in cystic expansion of odontogenic cysts, expression of these proteins were analysed in radicular and dentigerous cysts. DESIGN:The immunohistochemistry expression of these biomarkers were evaluated and measured in lining epithelium and fibrous capsule of the radicular (n=20) and dentigerous cysts (n=20). RESULTS:A similar expression in lining epithelium was observed in the lesions. The fibrous capsule of dentigerous cyst showed a higher content of RANK-positive and RANKL-positive cells than fibrous capsule of radicular cyst. In the lining epithelium the RANKL/OPG ratio showed higher numbers of OPG-positive than RANKL-positive cells, whereas fibrous capsule of the cysts had a tendency to present a similar expression (OPG=RANKL). CONCLUSION:Ours findings indicate the presence of RANK, RANKL and OPG in cysts. Moreover, increased expression of OPG compared to RANKL in the lining epithelium could contribute to the differential bone resorption activity in theses lesions.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

de Moraes M,de Lucena HF,de Azevedo PR,Queiroz LM,Costa Ade L

doi

10.1016/j.archoralbio.2011.05.009

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

1256-63

issue

11

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(11)00163-4

journal_volume

56

pub_type

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